The combination of positive and negative descriptions could be used to enrich the plot of the novel, shape the character image, and express the theme. Specifically, it had the following functions: 1. Enriching the plot: The combination of the front and side descriptions can let the readers understand the story more comprehensively. From different angles, the characters 'personalities and behaviors can be shown to make the plot more vivid and interesting. 2. Shaping the character image: The combination of the front and side descriptions can show the character's personality, quality, thoughts, etc. by describing the character's language, behavior, appearance, etc., so that the reader can have a deeper understanding of the character. 3. The theme of the novel: The combination of the front and side descriptions can express the theme of the novel by describing the words and deeds of the characters, revealing the meaning and meaning of the theme. 4. Enhancement of the novel's legibility and artistry: The combination of the front and side descriptions can make the novel more literary and readable, allowing the readers to better understand and feel the meaning and artistic conception of the novel. The combination of positive and negative descriptions was a common technique in writing. It could help the author better show the character's personality, plot development, theme expression, etc. to improve the quality and artistic value of the novel.